Chambering and rebarrelingBlack Ops Tactical takes great pride in providing you a professional and accurate chambering service. Our machining is started with a high quality barrel blank of your choice, we recommend Bartlien, Brux and Kreiger to name a few, other brands can also be installed. The rifle barrel is then indicated to within .0002 thousandths of concentricity for threading and chambering. We use through barrel coolant to achieve a high polished and precise chamber for the highest accuracy possible.